Clive Anderson and guests expose the 'myth' of the concept of common-law marriage. 
Is severe morning sickness a sign of twins?
Duration: 01:36
In light of the Royal pregnancy, Tim Harford asks what severe morning sickness tells us about the chances of having twins. Yan Wong helps him look at the figures.
Available since: Mon 10 Dec 2012
This clip is from
More or Less Royal twins and the Autumn Statement
Tim Harford asks what severe morning sickness tells us about the chances of having twins.
First broadcast: 07 Dec 2012
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